Mostly no, with a small yes.
If you upload a new personal statement after we have downloaded it, the new one completely replaces the old one. There is no obvious mention that this has happened, or what changes have been made, etc. So, mostly the answer is no.
However, if a PD wants to really check this out and knows how ERAS works, we can bring up a window demonstrating all changes to the entire set of applications over some period of time. You can't just check it for a single application, you get the whole list of apps. You can then scan through and actually see what has been changed. However, you cannot see the old PS any more -- it is gone from our system forever.
Basically, it's a ton of work, really clunky, and you can't see what the old PS said, so it won't happen.